libzfs_import.c revision 219089
1/* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21/* 22 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 23 */ 24 25/* 26 * Pool import support functions. 27 * 28 * To import a pool, we rely on reading the configuration information from the 29 * ZFS label of each device. If we successfully read the label, then we 30 * organize the configuration information in the following hierarchy: 31 * 32 * pool guid -> toplevel vdev guid -> label txg 33 * 34 * Duplicate entries matching this same tuple will be discarded. Once we have 35 * examined every device, we pick the best label txg config for each toplevel 36 * vdev. We then arrange these toplevel vdevs into a complete pool config, and 37 * update any paths that have changed. Finally, we attempt to import the pool 38 * using our derived config, and record the results. 39 */ 40 41#include <ctype.h> 42#include <devid.h> 43#include <dirent.h> 44#include <errno.h> 45#include <libintl.h> 46#include <stddef.h> 47#include <stdlib.h> 48#include <string.h> 49#include <sys/stat.h> 50#include <unistd.h> 51#include <fcntl.h> 52#include <thread_pool.h> 53#include <libgeom.h> 54 55#include <sys/vdev_impl.h> 56 57#include "libzfs.h" 58#include "libzfs_impl.h" 59 60/* 61 * Intermediate structures used to gather configuration information. 62 */ 63typedef struct config_entry { 64 uint64_t ce_txg; 65 nvlist_t *ce_config; 66 struct config_entry *ce_next; 67} config_entry_t; 68 69typedef struct vdev_entry { 70 uint64_t ve_guid; 71 config_entry_t *ve_configs; 72 struct vdev_entry *ve_next; 73} vdev_entry_t; 74 75typedef struct pool_entry { 76 uint64_t pe_guid; 77 vdev_entry_t *pe_vdevs; 78 struct pool_entry *pe_next; 79} pool_entry_t; 80 81typedef struct name_entry { 82 char *ne_name; 83 uint64_t ne_guid; 84 struct name_entry *ne_next; 85} name_entry_t; 86 87typedef struct pool_list { 88 pool_entry_t *pools; 89 name_entry_t *names; 90} pool_list_t; 91 92static char * 93get_devid(const char *path) 94{ 95 int fd; 96 ddi_devid_t devid; 97 char *minor, *ret; 98 99 if ((fd = open(path, O_RDONLY)) < 0) 100 return (NULL); 101 102 minor = NULL; 103 ret = NULL; 104 if (devid_get(fd, &devid) == 0) { 105 if (devid_get_minor_name(fd, &minor) == 0) 106 ret = devid_str_encode(devid, minor); 107 if (minor != NULL) 108 devid_str_free(minor); 109 devid_free(devid); 110 } 111 (void) close(fd); 112 113 return (ret); 114} 115 116 117/* 118 * Go through and fix up any path and/or devid information for the given vdev 119 * configuration. 120 */ 121static int 122fix_paths(nvlist_t *nv, name_entry_t *names) 123{ 124 nvlist_t **child; 125 uint_t c, children; 126 uint64_t guid; 127 name_entry_t *ne, *best; 128 char *path, *devid; 129 int matched; 130 131 if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_CHILDREN, 132 &child, &children) == 0) { 133 for (c = 0; c < children; c++) 134 if (fix_paths(child[c], names) != 0) 135 return (-1); 136 return (0); 137 } 138 139 /* 140 * This is a leaf (file or disk) vdev. In either case, go through 141 * the name list and see if we find a matching guid. If so, replace 142 * the path and see if we can calculate a new devid. 143 * 144 * There may be multiple names associated with a particular guid, in 145 * which case we have overlapping slices or multiple paths to the same 146 * disk. If this is the case, then we want to pick the path that is 147 * the most similar to the original, where "most similar" is the number 148 * of matching characters starting from the end of the path. This will 149 * preserve slice numbers even if the disks have been reorganized, and 150 * will also catch preferred disk names if multiple paths exist. 151 */ 152 verify(nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &guid) == 0); 153 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_PATH, &path) != 0) 154 path = NULL; 155 156 matched = 0; 157 best = NULL; 158 for (ne = names; ne != NULL; ne = ne->ne_next) { 159 if (ne->ne_guid == guid) { 160 const char *src, *dst; 161 int count; 162 163 if (path == NULL) { 164 best = ne; 165 break; 166 } 167 168 src = ne->ne_name + strlen(ne->ne_name) - 1; 169 dst = path + strlen(path) - 1; 170 for (count = 0; src >= ne->ne_name && dst >= path; 171 src--, dst--, count++) 172 if (*src != *dst) 173 break; 174 175 /* 176 * At this point, 'count' is the number of characters 177 * matched from the end. 178 */ 179 if (count > matched || best == NULL) { 180 best = ne; 181 matched = count; 182 } 183 } 184 } 185 186 if (best == NULL) 187 return (0); 188 189 if (nvlist_add_string(nv, ZPOOL_CONFIG_PATH, best->ne_name) != 0) 190 return (-1); 191 192 if ((devid = get_devid(best->ne_name)) == NULL) { 193 (void) nvlist_remove_all(nv, ZPOOL_CONFIG_DEVID); 194 } else { 195 if (nvlist_add_string(nv, ZPOOL_CONFIG_DEVID, devid) != 0) 196 return (-1); 197 devid_str_free(devid); 198 } 199 200 return (0); 201} 202 203/* 204 * Add the given configuration to the list of known devices. 205 */ 206static int 207add_config(libzfs_handle_t *hdl, pool_list_t *pl, const char *path, 208 nvlist_t *config) 209{ 210 uint64_t pool_guid, vdev_guid, top_guid, txg, state; 211 pool_entry_t *pe; 212 vdev_entry_t *ve; 213 config_entry_t *ce; 214 name_entry_t *ne; 215 216 /* 217 * If this is a hot spare not currently in use or level 2 cache 218 * device, add it to the list of names to translate, but don't do 219 * anything else. 220 */ 221 if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_STATE, 222 &state) == 0 && 223 (state == POOL_STATE_SPARE || state == POOL_STATE_L2CACHE) && 224 nvlist_lookup_uint64(config, ZPOOL_CONFIG_GUID, &vdev_guid) == 0) { 225 if ((ne = zfs_alloc(hdl, sizeof (name_entry_t))) == NULL) 226 return (-1); 227 228 if ((ne->ne_name = zfs_strdup(hdl, path)) == NULL) { 229 free(ne); 230 return (-1); 231 } 232 ne->ne_guid = vdev_guid; 233 ne->ne_next = pl->names; 234 pl->names = ne; 235 return (0); 236 } 237 238 /* 239 * If we have a valid config but cannot read any of these fields, then 240 * it means we have a half-initialized label. In vdev_label_init() 241 * we write a label with txg == 0 so that we can identify the device 242 * in case the user refers to the same disk later on. If we fail to 243 * create the pool, we'll be left with a label in this state 244 * which should not be considered part of a valid pool. 245 */ 246 if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID, 247 &pool_guid) != 0 || 248 nvlist_lookup_uint64(config, ZPOOL_CONFIG_GUID, 249 &vdev_guid) != 0 || 250 nvlist_lookup_uint64(config, ZPOOL_CONFIG_TOP_GUID, 251 &top_guid) != 0 || 252 nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_TXG, 253 &txg) != 0 || txg == 0) { 254 nvlist_free(config); 255 return (0); 256 } 257 258 /* 259 * First, see if we know about this pool. If not, then add it to the 260 * list of known pools. 261 */ 262 for (pe = pl->pools; pe != NULL; pe = pe->pe_next) { 263 if (pe->pe_guid == pool_guid) 264 break; 265 } 266 267 if (pe == NULL) { 268 if ((pe = zfs_alloc(hdl, sizeof (pool_entry_t))) == NULL) { 269 nvlist_free(config); 270 return (-1); 271 } 272 pe->pe_guid = pool_guid; 273 pe->pe_next = pl->pools; 274 pl->pools = pe; 275 } 276 277 /* 278 * Second, see if we know about this toplevel vdev. Add it if its 279 * missing. 280 */ 281 for (ve = pe->pe_vdevs; ve != NULL; ve = ve->ve_next) { 282 if (ve->ve_guid == top_guid) 283 break; 284 } 285 286 if (ve == NULL) { 287 if ((ve = zfs_alloc(hdl, sizeof (vdev_entry_t))) == NULL) { 288 nvlist_free(config); 289 return (-1); 290 } 291 ve->ve_guid = top_guid; 292 ve->ve_next = pe->pe_vdevs; 293 pe->pe_vdevs = ve; 294 } 295 296 /* 297 * Third, see if we have a config with a matching transaction group. If 298 * so, then we do nothing. Otherwise, add it to the list of known 299 * configs. 300 */ 301 for (ce = ve->ve_configs; ce != NULL; ce = ce->ce_next) { 302 if (ce->ce_txg == txg) 303 break; 304 } 305 306 if (ce == NULL) { 307 if ((ce = zfs_alloc(hdl, sizeof (config_entry_t))) == NULL) { 308 nvlist_free(config); 309 return (-1); 310 } 311 ce->ce_txg = txg; 312 ce->ce_config = config; 313 ce->ce_next = ve->ve_configs; 314 ve->ve_configs = ce; 315 } else { 316 nvlist_free(config); 317 } 318 319 /* 320 * At this point we've successfully added our config to the list of 321 * known configs. The last thing to do is add the vdev guid -> path 322 * mappings so that we can fix up the configuration as necessary before 323 * doing the import. 324 */ 325 if ((ne = zfs_alloc(hdl, sizeof (name_entry_t))) == NULL) 326 return (-1); 327 328 if ((ne->ne_name = zfs_strdup(hdl, path)) == NULL) { 329 free(ne); 330 return (-1); 331 } 332 333 ne->ne_guid = vdev_guid; 334 ne->ne_next = pl->names; 335 pl->names = ne; 336 337 return (0); 338} 339 340/* 341 * Returns true if the named pool matches the given GUID. 342 */ 343static int 344pool_active(libzfs_handle_t *hdl, const char *name, uint64_t guid, 345 boolean_t *isactive) 346{ 347 zpool_handle_t *zhp; 348 uint64_t theguid; 349 350 if (zpool_open_silent(hdl, name, &zhp) != 0) 351 return (-1); 352 353 if (zhp == NULL) { 354 *isactive = B_FALSE; 355 return (0); 356 } 357 358 verify(nvlist_lookup_uint64(zhp->zpool_config, ZPOOL_CONFIG_POOL_GUID, 359 &theguid) == 0); 360 361 zpool_close(zhp); 362 363 *isactive = (theguid == guid); 364 return (0); 365} 366 367static nvlist_t * 368refresh_config(libzfs_handle_t *hdl, nvlist_t *config) 369{ 370 nvlist_t *nvl; 371 zfs_cmd_t zc = { 0 }; 372 int err; 373 374 if (zcmd_write_conf_nvlist(hdl, &zc, config) != 0) 375 return (NULL); 376 377 if (zcmd_alloc_dst_nvlist(hdl, &zc, 378 zc.zc_nvlist_conf_size * 2) != 0) { 379 zcmd_free_nvlists(&zc); 380 return (NULL); 381 } 382 383 while ((err = ioctl(hdl->libzfs_fd, ZFS_IOC_POOL_TRYIMPORT, 384 &zc)) != 0 && errno == ENOMEM) { 385 if (zcmd_expand_dst_nvlist(hdl, &zc) != 0) { 386 zcmd_free_nvlists(&zc); 387 return (NULL); 388 } 389 } 390 391 if (err) { 392 zcmd_free_nvlists(&zc); 393 return (NULL); 394 } 395 396 if (zcmd_read_dst_nvlist(hdl, &zc, &nvl) != 0) { 397 zcmd_free_nvlists(&zc); 398 return (NULL); 399 } 400 401 zcmd_free_nvlists(&zc); 402 return (nvl); 403} 404 405/* 406 * Determine if the vdev id is a hole in the namespace. 407 */ 408boolean_t 409vdev_is_hole(uint64_t *hole_array, uint_t holes, uint_t id) 410{ 411 for (int c = 0; c < holes; c++) { 412 413 /* Top-level is a hole */ 414 if (hole_array[c] == id) 415 return (B_TRUE); 416 } 417 return (B_FALSE); 418} 419 420/* 421 * Convert our list of pools into the definitive set of configurations. We 422 * start by picking the best config for each toplevel vdev. Once that's done, 423 * we assemble the toplevel vdevs into a full config for the pool. We make a 424 * pass to fix up any incorrect paths, and then add it to the main list to 425 * return to the user. 426 */ 427static nvlist_t * 428get_configs(libzfs_handle_t *hdl, pool_list_t *pl, boolean_t active_ok) 429{ 430 pool_entry_t *pe; 431 vdev_entry_t *ve; 432 config_entry_t *ce; 433 nvlist_t *ret = NULL, *config = NULL, *tmp, *nvtop, *nvroot; 434 nvlist_t **spares, **l2cache; 435 uint_t i, nspares, nl2cache; 436 boolean_t config_seen; 437 uint64_t best_txg; 438 char *name, *hostname; 439 uint64_t version, guid; 440 uint_t children = 0; 441 nvlist_t **child = NULL; 442 uint_t holes; 443 uint64_t *hole_array, max_id; 444 uint_t c; 445 boolean_t isactive; 446 uint64_t hostid; 447 nvlist_t *nvl; 448 boolean_t found_one = B_FALSE; 449 boolean_t valid_top_config = B_FALSE; 450 451 if (nvlist_alloc(&ret, 0, 0) != 0) 452 goto nomem; 453 454 for (pe = pl->pools; pe != NULL; pe = pe->pe_next) { 455 uint64_t id, max_txg = 0; 456 457 if (nvlist_alloc(&config, NV_UNIQUE_NAME, 0) != 0) 458 goto nomem; 459 config_seen = B_FALSE; 460 461 /* 462 * Iterate over all toplevel vdevs. Grab the pool configuration 463 * from the first one we find, and then go through the rest and 464 * add them as necessary to the 'vdevs' member of the config. 465 */ 466 for (ve = pe->pe_vdevs; ve != NULL; ve = ve->ve_next) { 467 468 /* 469 * Determine the best configuration for this vdev by 470 * selecting the config with the latest transaction 471 * group. 472 */ 473 best_txg = 0; 474 for (ce = ve->ve_configs; ce != NULL; 475 ce = ce->ce_next) { 476 477 if (ce->ce_txg > best_txg) { 478 tmp = ce->ce_config; 479 best_txg = ce->ce_txg; 480 } 481 } 482 483 /* 484 * We rely on the fact that the max txg for the 485 * pool will contain the most up-to-date information 486 * about the valid top-levels in the vdev namespace. 487 */ 488 if (best_txg > max_txg) { 489 (void) nvlist_remove(config, 490 ZPOOL_CONFIG_VDEV_CHILDREN, 491 DATA_TYPE_UINT64); 492 (void) nvlist_remove(config, 493 ZPOOL_CONFIG_HOLE_ARRAY, 494 DATA_TYPE_UINT64_ARRAY); 495 496 max_txg = best_txg; 497 hole_array = NULL; 498 holes = 0; 499 max_id = 0; 500 valid_top_config = B_FALSE; 501 502 if (nvlist_lookup_uint64(tmp, 503 ZPOOL_CONFIG_VDEV_CHILDREN, &max_id) == 0) { 504 verify(nvlist_add_uint64(config, 505 ZPOOL_CONFIG_VDEV_CHILDREN, 506 max_id) == 0); 507 valid_top_config = B_TRUE; 508 } 509 510 if (nvlist_lookup_uint64_array(tmp, 511 ZPOOL_CONFIG_HOLE_ARRAY, &hole_array, 512 &holes) == 0) { 513 verify(nvlist_add_uint64_array(config, 514 ZPOOL_CONFIG_HOLE_ARRAY, 515 hole_array, holes) == 0); 516 } 517 } 518 519 if (!config_seen) { 520 /* 521 * Copy the relevant pieces of data to the pool 522 * configuration: 523 * 524 * version 525 * pool guid 526 * name 527 * pool state 528 * hostid (if available) 529 * hostname (if available) 530 */ 531 uint64_t state; 532 533 verify(nvlist_lookup_uint64(tmp, 534 ZPOOL_CONFIG_VERSION, &version) == 0); 535 if (nvlist_add_uint64(config, 536 ZPOOL_CONFIG_VERSION, version) != 0) 537 goto nomem; 538 verify(nvlist_lookup_uint64(tmp, 539 ZPOOL_CONFIG_POOL_GUID, &guid) == 0); 540 if (nvlist_add_uint64(config, 541 ZPOOL_CONFIG_POOL_GUID, guid) != 0) 542 goto nomem; 543 verify(nvlist_lookup_string(tmp, 544 ZPOOL_CONFIG_POOL_NAME, &name) == 0); 545 if (nvlist_add_string(config, 546 ZPOOL_CONFIG_POOL_NAME, name) != 0) 547 goto nomem; 548 verify(nvlist_lookup_uint64(tmp, 549 ZPOOL_CONFIG_POOL_STATE, &state) == 0); 550 if (nvlist_add_uint64(config, 551 ZPOOL_CONFIG_POOL_STATE, state) != 0) 552 goto nomem; 553 hostid = 0; 554 if (nvlist_lookup_uint64(tmp, 555 ZPOOL_CONFIG_HOSTID, &hostid) == 0) { 556 if (nvlist_add_uint64(config, 557 ZPOOL_CONFIG_HOSTID, hostid) != 0) 558 goto nomem; 559 verify(nvlist_lookup_string(tmp, 560 ZPOOL_CONFIG_HOSTNAME, 561 &hostname) == 0); 562 if (nvlist_add_string(config, 563 ZPOOL_CONFIG_HOSTNAME, 564 hostname) != 0) 565 goto nomem; 566 } 567 568 config_seen = B_TRUE; 569 } 570 571 /* 572 * Add this top-level vdev to the child array. 573 */ 574 verify(nvlist_lookup_nvlist(tmp, 575 ZPOOL_CONFIG_VDEV_TREE, &nvtop) == 0); 576 verify(nvlist_lookup_uint64(nvtop, ZPOOL_CONFIG_ID, 577 &id) == 0); 578 579 if (id >= children) { 580 nvlist_t **newchild; 581 582 newchild = zfs_alloc(hdl, (id + 1) * 583 sizeof (nvlist_t *)); 584 if (newchild == NULL) 585 goto nomem; 586 587 for (c = 0; c < children; c++) 588 newchild[c] = child[c]; 589 590 free(child); 591 child = newchild; 592 children = id + 1; 593 } 594 if (nvlist_dup(nvtop, &child[id], 0) != 0) 595 goto nomem; 596 597 } 598 599 /* 600 * If we have information about all the top-levels then 601 * clean up the nvlist which we've constructed. This 602 * means removing any extraneous devices that are 603 * beyond the valid range or adding devices to the end 604 * of our array which appear to be missing. 605 */ 606 if (valid_top_config) { 607 if (max_id < children) { 608 for (c = max_id; c < children; c++) 609 nvlist_free(child[c]); 610 children = max_id; 611 } else if (max_id > children) { 612 nvlist_t **newchild; 613 614 newchild = zfs_alloc(hdl, (max_id) * 615 sizeof (nvlist_t *)); 616 if (newchild == NULL) 617 goto nomem; 618 619 for (c = 0; c < children; c++) 620 newchild[c] = child[c]; 621 622 free(child); 623 child = newchild; 624 children = max_id; 625 } 626 } 627 628 verify(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID, 629 &guid) == 0); 630 631 /* 632 * The vdev namespace may contain holes as a result of 633 * device removal. We must add them back into the vdev 634 * tree before we process any missing devices. 635 */ 636 if (holes > 0) { 637 ASSERT(valid_top_config); 638 639 for (c = 0; c < children; c++) { 640 nvlist_t *holey; 641 642 if (child[c] != NULL || 643 !vdev_is_hole(hole_array, holes, c)) 644 continue; 645 646 if (nvlist_alloc(&holey, NV_UNIQUE_NAME, 647 0) != 0) 648 goto nomem; 649 650 /* 651 * Holes in the namespace are treated as 652 * "hole" top-level vdevs and have a 653 * special flag set on them. 654 */ 655 if (nvlist_add_string(holey, 656 ZPOOL_CONFIG_TYPE, 657 VDEV_TYPE_HOLE) != 0 || 658 nvlist_add_uint64(holey, 659 ZPOOL_CONFIG_ID, c) != 0 || 660 nvlist_add_uint64(holey, 661 ZPOOL_CONFIG_GUID, 0ULL) != 0) 662 goto nomem; 663 child[c] = holey; 664 } 665 } 666 667 /* 668 * Look for any missing top-level vdevs. If this is the case, 669 * create a faked up 'missing' vdev as a placeholder. We cannot 670 * simply compress the child array, because the kernel performs 671 * certain checks to make sure the vdev IDs match their location 672 * in the configuration. 673 */ 674 for (c = 0; c < children; c++) { 675 if (child[c] == NULL) { 676 nvlist_t *missing; 677 if (nvlist_alloc(&missing, NV_UNIQUE_NAME, 678 0) != 0) 679 goto nomem; 680 if (nvlist_add_string(missing, 681 ZPOOL_CONFIG_TYPE, 682 VDEV_TYPE_MISSING) != 0 || 683 nvlist_add_uint64(missing, 684 ZPOOL_CONFIG_ID, c) != 0 || 685 nvlist_add_uint64(missing, 686 ZPOOL_CONFIG_GUID, 0ULL) != 0) { 687 nvlist_free(missing); 688 goto nomem; 689 } 690 child[c] = missing; 691 } 692 } 693 694 /* 695 * Put all of this pool's top-level vdevs into a root vdev. 696 */ 697 if (nvlist_alloc(&nvroot, NV_UNIQUE_NAME, 0) != 0) 698 goto nomem; 699 if (nvlist_add_string(nvroot, ZPOOL_CONFIG_TYPE, 700 VDEV_TYPE_ROOT) != 0 || 701 nvlist_add_uint64(nvroot, ZPOOL_CONFIG_ID, 0ULL) != 0 || 702 nvlist_add_uint64(nvroot, ZPOOL_CONFIG_GUID, guid) != 0 || 703 nvlist_add_nvlist_array(nvroot, ZPOOL_CONFIG_CHILDREN, 704 child, children) != 0) { 705 nvlist_free(nvroot); 706 goto nomem; 707 } 708 709 for (c = 0; c < children; c++) 710 nvlist_free(child[c]); 711 free(child); 712 children = 0; 713 child = NULL; 714 715 /* 716 * Go through and fix up any paths and/or devids based on our 717 * known list of vdev GUID -> path mappings. 718 */ 719 if (fix_paths(nvroot, pl->names) != 0) { 720 nvlist_free(nvroot); 721 goto nomem; 722 } 723 724 /* 725 * Add the root vdev to this pool's configuration. 726 */ 727 if (nvlist_add_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, 728 nvroot) != 0) { 729 nvlist_free(nvroot); 730 goto nomem; 731 } 732 nvlist_free(nvroot); 733 734 /* 735 * zdb uses this path to report on active pools that were 736 * imported or created using -R. 737 */ 738 if (active_ok) 739 goto add_pool; 740 741 /* 742 * Determine if this pool is currently active, in which case we 743 * can't actually import it. 744 */ 745 verify(nvlist_lookup_string(config, ZPOOL_CONFIG_POOL_NAME, 746 &name) == 0); 747 verify(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID, 748 &guid) == 0); 749 750 if (pool_active(hdl, name, guid, &isactive) != 0) 751 goto error; 752 753 if (isactive) { 754 nvlist_free(config); 755 config = NULL; 756 continue; 757 } 758 759 if ((nvl = refresh_config(hdl, config)) == NULL) { 760 nvlist_free(config); 761 config = NULL; 762 continue; 763 } 764 765 nvlist_free(config); 766 config = nvl; 767 768 /* 769 * Go through and update the paths for spares, now that we have 770 * them. 771 */ 772 verify(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, 773 &nvroot) == 0); 774 if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_SPARES, 775 &spares, &nspares) == 0) { 776 for (i = 0; i < nspares; i++) { 777 if (fix_paths(spares[i], pl->names) != 0) 778 goto nomem; 779 } 780 } 781 782 /* 783 * Update the paths for l2cache devices. 784 */ 785 if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_L2CACHE, 786 &l2cache, &nl2cache) == 0) { 787 for (i = 0; i < nl2cache; i++) { 788 if (fix_paths(l2cache[i], pl->names) != 0) 789 goto nomem; 790 } 791 } 792 793 /* 794 * Restore the original information read from the actual label. 795 */ 796 (void) nvlist_remove(config, ZPOOL_CONFIG_HOSTID, 797 DATA_TYPE_UINT64); 798 (void) nvlist_remove(config, ZPOOL_CONFIG_HOSTNAME, 799 DATA_TYPE_STRING); 800 if (hostid != 0) { 801 verify(nvlist_add_uint64(config, ZPOOL_CONFIG_HOSTID, 802 hostid) == 0); 803 verify(nvlist_add_string(config, ZPOOL_CONFIG_HOSTNAME, 804 hostname) == 0); 805 } 806 807add_pool: 808 /* 809 * Add this pool to the list of configs. 810 */ 811 verify(nvlist_lookup_string(config, ZPOOL_CONFIG_POOL_NAME, 812 &name) == 0); 813 if (nvlist_add_nvlist(ret, name, config) != 0) 814 goto nomem; 815 816 found_one = B_TRUE; 817 nvlist_free(config); 818 config = NULL; 819 } 820 821 if (!found_one) { 822 nvlist_free(ret); 823 ret = NULL; 824 } 825 826 return (ret); 827 828nomem: 829 (void) no_memory(hdl); 830error: 831 nvlist_free(config); 832 nvlist_free(ret); 833 for (c = 0; c < children; c++) 834 nvlist_free(child[c]); 835 free(child); 836 837 return (NULL); 838} 839 840/* 841 * Return the offset of the given label. 842 */ 843static uint64_t 844label_offset(uint64_t size, int l) 845{ 846 ASSERT(P2PHASE_TYPED(size, sizeof (vdev_label_t), uint64_t) == 0); 847 return (l * sizeof (vdev_label_t) + (l < VDEV_LABELS / 2 ? 848 0 : size - VDEV_LABELS * sizeof (vdev_label_t))); 849} 850 851/* 852 * Given a file descriptor, read the label information and return an nvlist 853 * describing the configuration, if there is one. 854 */ 855int 856zpool_read_label(int fd, nvlist_t **config) 857{ 858 struct stat64 statbuf; 859 int l; 860 vdev_label_t *label; 861 uint64_t state, txg, size; 862 863 *config = NULL; 864 865 if (fstat64(fd, &statbuf) == -1) 866 return (0); 867 size = P2ALIGN_TYPED(statbuf.st_size, sizeof (vdev_label_t), uint64_t); 868 869 if ((label = malloc(sizeof (vdev_label_t))) == NULL) 870 return (-1); 871 872 for (l = 0; l < VDEV_LABELS; l++) { 873 if (pread64(fd, label, sizeof (vdev_label_t), 874 label_offset(size, l)) != sizeof (vdev_label_t)) 875 continue; 876 877 if (nvlist_unpack(label->vl_vdev_phys.vp_nvlist, 878 sizeof (label->vl_vdev_phys.vp_nvlist), config, 0) != 0) 879 continue; 880 881 if (nvlist_lookup_uint64(*config, ZPOOL_CONFIG_POOL_STATE, 882 &state) != 0 || state > POOL_STATE_L2CACHE) { 883 nvlist_free(*config); 884 continue; 885 } 886 887 if (state != POOL_STATE_SPARE && state != POOL_STATE_L2CACHE && 888 (nvlist_lookup_uint64(*config, ZPOOL_CONFIG_POOL_TXG, 889 &txg) != 0 || txg == 0)) { 890 nvlist_free(*config); 891 continue; 892 } 893 894 free(label); 895 return (0); 896 } 897 898 free(label); 899 *config = NULL; 900 return (0); 901} 902 903typedef struct rdsk_node { 904 char *rn_name; 905 int rn_dfd; 906 libzfs_handle_t *rn_hdl; 907 nvlist_t *rn_config; 908 avl_tree_t *rn_avl; 909 avl_node_t rn_node; 910 boolean_t rn_nozpool; 911} rdsk_node_t; 912 913static int 914slice_cache_compare(const void *arg1, const void *arg2) 915{ 916 const char *nm1 = ((rdsk_node_t *)arg1)->rn_name; 917 const char *nm2 = ((rdsk_node_t *)arg2)->rn_name; 918 char *nm1slice, *nm2slice; 919 int rv; 920 921 /* 922 * slices zero and two are the most likely to provide results, 923 * so put those first 924 */ 925 nm1slice = strstr(nm1, "s0"); 926 nm2slice = strstr(nm2, "s0"); 927 if (nm1slice && !nm2slice) { 928 return (-1); 929 } 930 if (!nm1slice && nm2slice) { 931 return (1); 932 } 933 nm1slice = strstr(nm1, "s2"); 934 nm2slice = strstr(nm2, "s2"); 935 if (nm1slice && !nm2slice) { 936 return (-1); 937 } 938 if (!nm1slice && nm2slice) { 939 return (1); 940 } 941 942 rv = strcmp(nm1, nm2); 943 if (rv == 0) 944 return (0); 945 return (rv > 0 ? 1 : -1); 946} 947 948#ifdef sun 949static void 950check_one_slice(avl_tree_t *r, char *diskname, uint_t partno, 951 diskaddr_t size, uint_t blksz) 952{ 953 rdsk_node_t tmpnode; 954 rdsk_node_t *node; 955 char sname[MAXNAMELEN]; 956 957 tmpnode.rn_name = &sname[0]; 958 (void) snprintf(tmpnode.rn_name, MAXNAMELEN, "%s%u", 959 diskname, partno); 960 /* 961 * protect against division by zero for disk labels that 962 * contain a bogus sector size 963 */ 964 if (blksz == 0) 965 blksz = DEV_BSIZE; 966 /* too small to contain a zpool? */ 967 if ((size < (SPA_MINDEVSIZE / blksz)) && 968 (node = avl_find(r, &tmpnode, NULL))) 969 node->rn_nozpool = B_TRUE; 970} 971#endif /* sun */ 972 973static void 974nozpool_all_slices(avl_tree_t *r, const char *sname) 975{ 976#ifdef sun 977 char diskname[MAXNAMELEN]; 978 char *ptr; 979 int i; 980 981 (void) strncpy(diskname, sname, MAXNAMELEN); 982 if (((ptr = strrchr(diskname, 's')) == NULL) && 983 ((ptr = strrchr(diskname, 'p')) == NULL)) 984 return; 985 ptr[0] = 's'; 986 ptr[1] = '\0'; 987 for (i = 0; i < NDKMAP; i++) 988 check_one_slice(r, diskname, i, 0, 1); 989 ptr[0] = 'p'; 990 for (i = 0; i <= FD_NUMPART; i++) 991 check_one_slice(r, diskname, i, 0, 1); 992#endif /* sun */ 993} 994 995static void 996check_slices(avl_tree_t *r, int fd, const char *sname) 997{ 998#ifdef sun 999 struct extvtoc vtoc; 1000 struct dk_gpt *gpt; 1001 char diskname[MAXNAMELEN]; 1002 char *ptr; 1003 int i; 1004 1005 (void) strncpy(diskname, sname, MAXNAMELEN); 1006 if ((ptr = strrchr(diskname, 's')) == NULL || !isdigit(ptr[1])) 1007 return; 1008 ptr[1] = '\0'; 1009 1010 if (read_extvtoc(fd, &vtoc) >= 0) { 1011 for (i = 0; i < NDKMAP; i++) 1012 check_one_slice(r, diskname, i, 1013 vtoc.v_part[i].p_size, vtoc.v_sectorsz); 1014 } else if (efi_alloc_and_read(fd, &gpt) >= 0) { 1015 /* 1016 * on x86 we'll still have leftover links that point 1017 * to slices s[9-15], so use NDKMAP instead 1018 */ 1019 for (i = 0; i < NDKMAP; i++) 1020 check_one_slice(r, diskname, i, 1021 gpt->efi_parts[i].p_size, gpt->efi_lbasize); 1022 /* nodes p[1-4] are never used with EFI labels */ 1023 ptr[0] = 'p'; 1024 for (i = 1; i <= FD_NUMPART; i++) 1025 check_one_slice(r, diskname, i, 0, 1); 1026 efi_free(gpt); 1027 } 1028#endif /* sun */ 1029} 1030 1031static void 1032zpool_open_func(void *arg) 1033{ 1034 rdsk_node_t *rn = arg; 1035 struct stat64 statbuf; 1036 nvlist_t *config; 1037 int fd; 1038 1039 if (rn->rn_nozpool) 1040 return; 1041 if ((fd = openat64(rn->rn_dfd, rn->rn_name, O_RDONLY)) < 0) { 1042 /* symlink to a device that's no longer there */ 1043 if (errno == ENOENT) 1044 nozpool_all_slices(rn->rn_avl, rn->rn_name); 1045 return; 1046 } 1047 /* 1048 * Ignore failed stats. We only want regular 1049 * files, character devs and block devs. 1050 */ 1051 if (fstat64(fd, &statbuf) != 0 || 1052 (!S_ISREG(statbuf.st_mode) && 1053 !S_ISCHR(statbuf.st_mode) && 1054 !S_ISBLK(statbuf.st_mode))) { 1055 (void) close(fd); 1056 return; 1057 } 1058 /* this file is too small to hold a zpool */ 1059 if (S_ISREG(statbuf.st_mode) && 1060 statbuf.st_size < SPA_MINDEVSIZE) { 1061 (void) close(fd); 1062 return; 1063 } else if (!S_ISREG(statbuf.st_mode)) { 1064 /* 1065 * Try to read the disk label first so we don't have to 1066 * open a bunch of minor nodes that can't have a zpool. 1067 */ 1068 check_slices(rn->rn_avl, fd, rn->rn_name); 1069 } 1070 1071 if ((zpool_read_label(fd, &config)) != 0) { 1072 (void) close(fd); 1073 (void) no_memory(rn->rn_hdl); 1074 return; 1075 } 1076 (void) close(fd); 1077 1078 1079 rn->rn_config = config; 1080 if (config != NULL) { 1081 assert(rn->rn_nozpool == B_FALSE); 1082 } 1083} 1084 1085/* 1086 * Given a file descriptor, clear (zero) the label information. This function 1087 * is currently only used in the appliance stack as part of the ZFS sysevent 1088 * module. 1089 */ 1090int 1091zpool_clear_label(int fd) 1092{ 1093 struct stat64 statbuf; 1094 int l; 1095 vdev_label_t *label; 1096 uint64_t size; 1097 1098 if (fstat64(fd, &statbuf) == -1) 1099 return (0); 1100 size = P2ALIGN_TYPED(statbuf.st_size, sizeof (vdev_label_t), uint64_t); 1101 1102 if ((label = calloc(sizeof (vdev_label_t), 1)) == NULL) 1103 return (-1); 1104 1105 for (l = 0; l < VDEV_LABELS; l++) { 1106 if (pwrite64(fd, label, sizeof (vdev_label_t), 1107 label_offset(size, l)) != sizeof (vdev_label_t)) 1108 return (-1); 1109 } 1110 1111 free(label); 1112 return (0); 1113} 1114 1115/* 1116 * Given a list of directories to search, find all pools stored on disk. This 1117 * includes partial pools which are not available to import. If no args are 1118 * given (argc is 0), then the default directory (/dev/dsk) is searched. 1119 * poolname or guid (but not both) are provided by the caller when trying 1120 * to import a specific pool. 1121 */ 1122static nvlist_t * 1123zpool_find_import_impl(libzfs_handle_t *hdl, importargs_t *iarg) 1124{ 1125 int i, dirs = iarg->paths; 1126 DIR *dirp = NULL; 1127 struct dirent64 *dp; 1128 char path[MAXPATHLEN]; 1129 char *end, **dir = iarg->path; 1130 size_t pathleft; 1131 nvlist_t *ret = NULL; 1132 static char *default_dir = "/dev/dsk"; 1133 pool_list_t pools = { 0 }; 1134 pool_entry_t *pe, *penext; 1135 vdev_entry_t *ve, *venext; 1136 config_entry_t *ce, *cenext; 1137 name_entry_t *ne, *nenext; 1138 avl_tree_t slice_cache; 1139 rdsk_node_t *slice; 1140 void *cookie; 1141 1142 if (dirs == 0) { 1143 dirs = 1; 1144 dir = &default_dir; 1145 } 1146 1147 /* 1148 * Go through and read the label configuration information from every 1149 * possible device, organizing the information according to pool GUID 1150 * and toplevel GUID. 1151 */ 1152 for (i = 0; i < dirs; i++) { 1153 tpool_t *t; 1154 char *rdsk; 1155 int dfd; 1156 1157 /* use realpath to normalize the path */ 1158 if (realpath(dir[i], path) == 0) { 1159 (void) zfs_error_fmt(hdl, EZFS_BADPATH, 1160 dgettext(TEXT_DOMAIN, "cannot open '%s'"), dir[i]); 1161 goto error; 1162 } 1163 end = &path[strlen(path)]; 1164 *end++ = '/'; 1165 *end = 0; 1166 pathleft = &path[sizeof (path)] - end; 1167 1168 /* 1169 * Using raw devices instead of block devices when we're 1170 * reading the labels skips a bunch of slow operations during 1171 * close(2) processing, so we replace /dev/dsk with /dev/rdsk. 1172 */ 1173 if (strcmp(path, "/dev/dsk/") == 0) 1174 rdsk = "/dev/"; 1175 else 1176 rdsk = path; 1177 1178 if ((dfd = open64(rdsk, O_RDONLY)) < 0 || 1179 (dirp = fdopendir(dfd)) == NULL) { 1180 zfs_error_aux(hdl, strerror(errno)); 1181 (void) zfs_error_fmt(hdl, EZFS_BADPATH, 1182 dgettext(TEXT_DOMAIN, "cannot open '%s'"), 1183 rdsk); 1184 goto error; 1185 } 1186 1187 avl_create(&slice_cache, slice_cache_compare, 1188 sizeof (rdsk_node_t), offsetof(rdsk_node_t, rn_node)); 1189 1190 if (strcmp(rdsk, "/dev/") == 0) { 1191 struct gmesh mesh; 1192 struct gclass *mp; 1193 struct ggeom *gp; 1194 struct gprovider *pp; 1195 1196 errno = geom_gettree(&mesh); 1197 if (errno != 0) { 1198 zfs_error_aux(hdl, strerror(errno)); 1199 (void) zfs_error_fmt(hdl, EZFS_BADPATH, 1200 dgettext(TEXT_DOMAIN, "cannot get GEOM tree")); 1201 goto error; 1202 } 1203 1204 LIST_FOREACH(mp, &mesh.lg_class, lg_class) { 1205 LIST_FOREACH(gp, &mp->lg_geom, lg_geom) { 1206 LIST_FOREACH(pp, &gp->lg_provider, lg_provider) { 1207 slice = zfs_alloc(hdl, sizeof (rdsk_node_t)); 1208 slice->rn_name = zfs_strdup(hdl, pp->lg_name); 1209 slice->rn_avl = &slice_cache; 1210 slice->rn_dfd = dfd; 1211 slice->rn_hdl = hdl; 1212 slice->rn_nozpool = B_FALSE; 1213 avl_add(&slice_cache, slice); 1214 } 1215 } 1216 } 1217 1218 geom_deletetree(&mesh); 1219 goto skipdir; 1220 } 1221 1222 /* 1223 * This is not MT-safe, but we have no MT consumers of libzfs 1224 */ 1225 while ((dp = readdir64(dirp)) != NULL) { 1226 const char *name = dp->d_name; 1227 if (name[0] == '.' && 1228 (name[1] == 0 || (name[1] == '.' && name[2] == 0))) 1229 continue; 1230 1231 slice = zfs_alloc(hdl, sizeof (rdsk_node_t)); 1232 slice->rn_name = zfs_strdup(hdl, name); 1233 slice->rn_avl = &slice_cache; 1234 slice->rn_dfd = dfd; 1235 slice->rn_hdl = hdl; 1236 slice->rn_nozpool = B_FALSE; 1237 avl_add(&slice_cache, slice); 1238 } 1239skipdir: 1240 /* 1241 * create a thread pool to do all of this in parallel; 1242 * rn_nozpool is not protected, so this is racy in that 1243 * multiple tasks could decide that the same slice can 1244 * not hold a zpool, which is benign. Also choose 1245 * double the number of processors; we hold a lot of 1246 * locks in the kernel, so going beyond this doesn't 1247 * buy us much. 1248 */ 1249 t = tpool_create(1, 2 * sysconf(_SC_NPROCESSORS_ONLN), 1250 0, NULL); 1251 for (slice = avl_first(&slice_cache); slice; 1252 (slice = avl_walk(&slice_cache, slice, 1253 AVL_AFTER))) 1254 (void) tpool_dispatch(t, zpool_open_func, slice); 1255 tpool_wait(t); 1256 tpool_destroy(t); 1257 1258 cookie = NULL; 1259 while ((slice = avl_destroy_nodes(&slice_cache, 1260 &cookie)) != NULL) { 1261 if (slice->rn_config != NULL) { 1262 nvlist_t *config = slice->rn_config; 1263 boolean_t matched = B_TRUE; 1264 1265 if (iarg->poolname != NULL) { 1266 char *pname; 1267 1268 matched = nvlist_lookup_string(config, 1269 ZPOOL_CONFIG_POOL_NAME, 1270 &pname) == 0 && 1271 strcmp(iarg->poolname, pname) == 0; 1272 } else if (iarg->guid != 0) { 1273 uint64_t this_guid; 1274 1275 matched = nvlist_lookup_uint64(config, 1276 ZPOOL_CONFIG_POOL_GUID, 1277 &this_guid) == 0 && 1278 iarg->guid == this_guid; 1279 } 1280 if (!matched) { 1281 nvlist_free(config); 1282 config = NULL; 1283 continue; 1284 } 1285 /* use the non-raw path for the config */ 1286 (void) strlcpy(end, slice->rn_name, pathleft); 1287 if (add_config(hdl, &pools, path, config) != 0) 1288 goto error; 1289 } 1290 free(slice->rn_name); 1291 free(slice); 1292 } 1293 avl_destroy(&slice_cache); 1294 1295 (void) closedir(dirp); 1296 dirp = NULL; 1297 } 1298 1299 ret = get_configs(hdl, &pools, iarg->can_be_active); 1300 1301error: 1302 for (pe = pools.pools; pe != NULL; pe = penext) { 1303 penext = pe->pe_next; 1304 for (ve = pe->pe_vdevs; ve != NULL; ve = venext) { 1305 venext = ve->ve_next; 1306 for (ce = ve->ve_configs; ce != NULL; ce = cenext) { 1307 cenext = ce->ce_next; 1308 if (ce->ce_config) 1309 nvlist_free(ce->ce_config); 1310 free(ce); 1311 } 1312 free(ve); 1313 } 1314 free(pe); 1315 } 1316 1317 for (ne = pools.names; ne != NULL; ne = nenext) { 1318 nenext = ne->ne_next; 1319 if (ne->ne_name) 1320 free(ne->ne_name); 1321 free(ne); 1322 } 1323 1324 if (dirp) 1325 (void) closedir(dirp); 1326 1327 return (ret); 1328} 1329 1330nvlist_t * 1331zpool_find_import(libzfs_handle_t *hdl, int argc, char **argv) 1332{ 1333 importargs_t iarg = { 0 }; 1334 1335 iarg.paths = argc; 1336 iarg.path = argv; 1337 1338 return (zpool_find_import_impl(hdl, &iarg)); 1339} 1340 1341/* 1342 * Given a cache file, return the contents as a list of importable pools. 1343 * poolname or guid (but not both) are provided by the caller when trying 1344 * to import a specific pool. 1345 */ 1346nvlist_t * 1347zpool_find_import_cached(libzfs_handle_t *hdl, const char *cachefile, 1348 char *poolname, uint64_t guid) 1349{ 1350 char *buf; 1351 int fd; 1352 struct stat64 statbuf; 1353 nvlist_t *raw, *src, *dst; 1354 nvlist_t *pools; 1355 nvpair_t *elem; 1356 char *name; 1357 uint64_t this_guid; 1358 boolean_t active; 1359 1360 verify(poolname == NULL || guid == 0); 1361 1362 if ((fd = open(cachefile, O_RDONLY)) < 0) { 1363 zfs_error_aux(hdl, "%s", strerror(errno)); 1364 (void) zfs_error(hdl, EZFS_BADCACHE, 1365 dgettext(TEXT_DOMAIN, "failed to open cache file")); 1366 return (NULL); 1367 } 1368 1369 if (fstat64(fd, &statbuf) != 0) { 1370 zfs_error_aux(hdl, "%s", strerror(errno)); 1371 (void) close(fd); 1372 (void) zfs_error(hdl, EZFS_BADCACHE, 1373 dgettext(TEXT_DOMAIN, "failed to get size of cache file")); 1374 return (NULL); 1375 } 1376 1377 if ((buf = zfs_alloc(hdl, statbuf.st_size)) == NULL) { 1378 (void) close(fd); 1379 return (NULL); 1380 } 1381 1382 if (read(fd, buf, statbuf.st_size) != statbuf.st_size) { 1383 (void) close(fd); 1384 free(buf); 1385 (void) zfs_error(hdl, EZFS_BADCACHE, 1386 dgettext(TEXT_DOMAIN, 1387 "failed to read cache file contents")); 1388 return (NULL); 1389 } 1390 1391 (void) close(fd); 1392 1393 if (nvlist_unpack(buf, statbuf.st_size, &raw, 0) != 0) { 1394 free(buf); 1395 (void) zfs_error(hdl, EZFS_BADCACHE, 1396 dgettext(TEXT_DOMAIN, 1397 "invalid or corrupt cache file contents")); 1398 return (NULL); 1399 } 1400 1401 free(buf); 1402 1403 /* 1404 * Go through and get the current state of the pools and refresh their 1405 * state. 1406 */ 1407 if (nvlist_alloc(&pools, 0, 0) != 0) { 1408 (void) no_memory(hdl); 1409 nvlist_free(raw); 1410 return (NULL); 1411 } 1412 1413 elem = NULL; 1414 while ((elem = nvlist_next_nvpair(raw, elem)) != NULL) { 1415 verify(nvpair_value_nvlist(elem, &src) == 0); 1416 1417 verify(nvlist_lookup_string(src, ZPOOL_CONFIG_POOL_NAME, 1418 &name) == 0); 1419 if (poolname != NULL && strcmp(poolname, name) != 0) 1420 continue; 1421 1422 verify(nvlist_lookup_uint64(src, ZPOOL_CONFIG_POOL_GUID, 1423 &this_guid) == 0); 1424 if (guid != 0) { 1425 verify(nvlist_lookup_uint64(src, ZPOOL_CONFIG_POOL_GUID, 1426 &this_guid) == 0); 1427 if (guid != this_guid) 1428 continue; 1429 } 1430 1431 if (pool_active(hdl, name, this_guid, &active) != 0) { 1432 nvlist_free(raw); 1433 nvlist_free(pools); 1434 return (NULL); 1435 } 1436 1437 if (active) 1438 continue; 1439 1440 if ((dst = refresh_config(hdl, src)) == NULL) { 1441 nvlist_free(raw); 1442 nvlist_free(pools); 1443 return (NULL); 1444 } 1445 1446 if (nvlist_add_nvlist(pools, nvpair_name(elem), dst) != 0) { 1447 (void) no_memory(hdl); 1448 nvlist_free(dst); 1449 nvlist_free(raw); 1450 nvlist_free(pools); 1451 return (NULL); 1452 } 1453 nvlist_free(dst); 1454 } 1455 1456 nvlist_free(raw); 1457 return (pools); 1458} 1459 1460static int 1461name_or_guid_exists(zpool_handle_t *zhp, void *data) 1462{ 1463 importargs_t *import = data; 1464 int found = 0; 1465 1466 if (import->poolname != NULL) { 1467 char *pool_name; 1468 1469 verify(nvlist_lookup_string(zhp->zpool_config, 1470 ZPOOL_CONFIG_POOL_NAME, &pool_name) == 0); 1471 if (strcmp(pool_name, import->poolname) == 0) 1472 found = 1; 1473 } else { 1474 uint64_t pool_guid; 1475 1476 verify(nvlist_lookup_uint64(zhp->zpool_config, 1477 ZPOOL_CONFIG_POOL_GUID, &pool_guid) == 0); 1478 if (pool_guid == import->guid) 1479 found = 1; 1480 } 1481 1482 zpool_close(zhp); 1483 return (found); 1484} 1485 1486nvlist_t * 1487zpool_search_import(libzfs_handle_t *hdl, importargs_t *import) 1488{ 1489 verify(import->poolname == NULL || import->guid == 0); 1490 1491 if (import->unique) 1492 import->exists = zpool_iter(hdl, name_or_guid_exists, import); 1493 1494 if (import->cachefile != NULL) 1495 return (zpool_find_import_cached(hdl, import->cachefile, 1496 import->poolname, import->guid)); 1497 1498 return (zpool_find_import_impl(hdl, import)); 1499} 1500 1501boolean_t 1502find_guid(nvlist_t *nv, uint64_t guid) 1503{ 1504 uint64_t tmp; 1505 nvlist_t **child; 1506 uint_t c, children; 1507 1508 verify(nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &tmp) == 0); 1509 if (tmp == guid) 1510 return (B_TRUE); 1511 1512 if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_CHILDREN, 1513 &child, &children) == 0) { 1514 for (c = 0; c < children; c++) 1515 if (find_guid(child[c], guid)) 1516 return (B_TRUE); 1517 } 1518 1519 return (B_FALSE); 1520} 1521 1522typedef struct aux_cbdata { 1523 const char *cb_type; 1524 uint64_t cb_guid; 1525 zpool_handle_t *cb_zhp; 1526} aux_cbdata_t; 1527 1528static int 1529find_aux(zpool_handle_t *zhp, void *data) 1530{ 1531 aux_cbdata_t *cbp = data; 1532 nvlist_t **list; 1533 uint_t i, count; 1534 uint64_t guid; 1535 nvlist_t *nvroot; 1536 1537 verify(nvlist_lookup_nvlist(zhp->zpool_config, ZPOOL_CONFIG_VDEV_TREE, 1538 &nvroot) == 0); 1539 1540 if (nvlist_lookup_nvlist_array(nvroot, cbp->cb_type, 1541 &list, &count) == 0) { 1542 for (i = 0; i < count; i++) { 1543 verify(nvlist_lookup_uint64(list[i], 1544 ZPOOL_CONFIG_GUID, &guid) == 0); 1545 if (guid == cbp->cb_guid) { 1546 cbp->cb_zhp = zhp; 1547 return (1); 1548 } 1549 } 1550 } 1551 1552 zpool_close(zhp); 1553 return (0); 1554} 1555 1556/* 1557 * Determines if the pool is in use. If so, it returns true and the state of 1558 * the pool as well as the name of the pool. Both strings are allocated and 1559 * must be freed by the caller. 1560 */ 1561int 1562zpool_in_use(libzfs_handle_t *hdl, int fd, pool_state_t *state, char **namestr, 1563 boolean_t *inuse) 1564{ 1565 nvlist_t *config; 1566 char *name; 1567 boolean_t ret; 1568 uint64_t guid, vdev_guid; 1569 zpool_handle_t *zhp; 1570 nvlist_t *pool_config; 1571 uint64_t stateval, isspare; 1572 aux_cbdata_t cb = { 0 }; 1573 boolean_t isactive; 1574 1575 *inuse = B_FALSE; 1576 1577 if (zpool_read_label(fd, &config) != 0) { 1578 (void) no_memory(hdl); 1579 return (-1); 1580 } 1581 1582 if (config == NULL) 1583 return (0); 1584 1585 verify(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_STATE, 1586 &stateval) == 0); 1587 verify(nvlist_lookup_uint64(config, ZPOOL_CONFIG_GUID, 1588 &vdev_guid) == 0); 1589 1590 if (stateval != POOL_STATE_SPARE && stateval != POOL_STATE_L2CACHE) { 1591 verify(nvlist_lookup_string(config, ZPOOL_CONFIG_POOL_NAME, 1592 &name) == 0); 1593 verify(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID, 1594 &guid) == 0); 1595 } 1596 1597 switch (stateval) { 1598 case POOL_STATE_EXPORTED: 1599 /* 1600 * A pool with an exported state may in fact be imported 1601 * read-only, so check the in-core state to see if it's 1602 * active and imported read-only. If it is, set 1603 * its state to active. 1604 */ 1605 if (pool_active(hdl, name, guid, &isactive) == 0 && isactive && 1606 (zhp = zpool_open_canfail(hdl, name)) != NULL && 1607 zpool_get_prop_int(zhp, ZPOOL_PROP_READONLY, NULL)) 1608 stateval = POOL_STATE_ACTIVE; 1609 1610 ret = B_TRUE; 1611 break; 1612 1613 case POOL_STATE_ACTIVE: 1614 /* 1615 * For an active pool, we have to determine if it's really part 1616 * of a currently active pool (in which case the pool will exist 1617 * and the guid will be the same), or whether it's part of an 1618 * active pool that was disconnected without being explicitly 1619 * exported. 1620 */ 1621 if (pool_active(hdl, name, guid, &isactive) != 0) { 1622 nvlist_free(config); 1623 return (-1); 1624 } 1625 1626 if (isactive) { 1627 /* 1628 * Because the device may have been removed while 1629 * offlined, we only report it as active if the vdev is 1630 * still present in the config. Otherwise, pretend like 1631 * it's not in use. 1632 */ 1633 if ((zhp = zpool_open_canfail(hdl, name)) != NULL && 1634 (pool_config = zpool_get_config(zhp, NULL)) 1635 != NULL) { 1636 nvlist_t *nvroot; 1637 1638 verify(nvlist_lookup_nvlist(pool_config, 1639 ZPOOL_CONFIG_VDEV_TREE, &nvroot) == 0); 1640 ret = find_guid(nvroot, vdev_guid); 1641 } else { 1642 ret = B_FALSE; 1643 } 1644 1645 /* 1646 * If this is an active spare within another pool, we 1647 * treat it like an unused hot spare. This allows the 1648 * user to create a pool with a hot spare that currently 1649 * in use within another pool. Since we return B_TRUE, 1650 * libdiskmgt will continue to prevent generic consumers 1651 * from using the device. 1652 */ 1653 if (ret && nvlist_lookup_uint64(config, 1654 ZPOOL_CONFIG_IS_SPARE, &isspare) == 0 && isspare) 1655 stateval = POOL_STATE_SPARE; 1656 1657 if (zhp != NULL) 1658 zpool_close(zhp); 1659 } else { 1660 stateval = POOL_STATE_POTENTIALLY_ACTIVE; 1661 ret = B_TRUE; 1662 } 1663 break; 1664 1665 case POOL_STATE_SPARE: 1666 /* 1667 * For a hot spare, it can be either definitively in use, or 1668 * potentially active. To determine if it's in use, we iterate 1669 * over all pools in the system and search for one with a spare 1670 * with a matching guid. 1671 * 1672 * Due to the shared nature of spares, we don't actually report 1673 * the potentially active case as in use. This means the user 1674 * can freely create pools on the hot spares of exported pools, 1675 * but to do otherwise makes the resulting code complicated, and 1676 * we end up having to deal with this case anyway. 1677 */ 1678 cb.cb_zhp = NULL; 1679 cb.cb_guid = vdev_guid; 1680 cb.cb_type = ZPOOL_CONFIG_SPARES; 1681 if (zpool_iter(hdl, find_aux, &cb) == 1) { 1682 name = (char *)zpool_get_name(cb.cb_zhp); 1683 ret = TRUE; 1684 } else { 1685 ret = FALSE; 1686 } 1687 break; 1688 1689 case POOL_STATE_L2CACHE: 1690 1691 /* 1692 * Check if any pool is currently using this l2cache device. 1693 */ 1694 cb.cb_zhp = NULL; 1695 cb.cb_guid = vdev_guid; 1696 cb.cb_type = ZPOOL_CONFIG_L2CACHE; 1697 if (zpool_iter(hdl, find_aux, &cb) == 1) { 1698 name = (char *)zpool_get_name(cb.cb_zhp); 1699 ret = TRUE; 1700 } else { 1701 ret = FALSE; 1702 } 1703 break; 1704 1705 default: 1706 ret = B_FALSE; 1707 } 1708 1709 1710 if (ret) { 1711 if ((*namestr = zfs_strdup(hdl, name)) == NULL) { 1712 if (cb.cb_zhp) 1713 zpool_close(cb.cb_zhp); 1714 nvlist_free(config); 1715 return (-1); 1716 } 1717 *state = (pool_state_t)stateval; 1718 } 1719 1720 if (cb.cb_zhp) 1721 zpool_close(cb.cb_zhp); 1722 1723 nvlist_free(config); 1724 *inuse = ret; 1725 return (0); 1726} 1727